Alec Thomas
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package kong
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import (
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"os"
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)
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// App is the default global instance. It is populated by Parse().
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var App *Kong
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// Parse constructs a new parser and parses the default command-line.
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func Parse(cli interface{}, options ...Option) string {
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parser, err := New(cli, options...)
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if err != nil {
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panic(err)
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}
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App = parser
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ctx, err := parser.Parse(os.Args[1:])
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parser.FatalIfErrorf(err)
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return ctx.Command()
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}
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// FatalIfErrorf terminates with an error message if err != nil.
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func FatalIfErrorf(err error, args ...interface{}) {
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if App == nil {
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panic("call kong.Parse() before using kong.FatalIfErrorf()")
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}
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App.FatalIfErrorf(err, args...)
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}
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// Errorf writes a message to Kong.Stderr with the application name prefixed.
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func Errorf(format string, args ...interface{}) {
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if App == nil {
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panic("call kong.Parse() before using kong.Errorf()")
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}
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App.Errorf(format, args...)
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}
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// Printf writes a message to Kong.Stdout with the application name prefixed.
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func Printf(format string, args ...interface{}) {
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if App == nil {
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panic("call kong.Parse() before using kong.Printf()")
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}
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App.Printf(format, args...)
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}
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